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    Subject[PATCH 3.16 158/357] NFSv4: Fix another bug in the close/open_downgrade code
    Date
    3.16-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Trond Myklebust <trond.myklebust@primarydata.com>

    commit cd9288ffaea4359d5cfe2b8d264911506aed26a4 upstream.

    James Drew reports another bug whereby the NFS client is now sending
    an OPEN_DOWNGRADE in a situation where it should really have sent a
    CLOSE: the client is opening the file for O_RDWR, but then trying to
    do a downgrade to O_RDONLY, which is not allowed by the NFSv4 spec.

    Reported-by: James Drews <drews@engr.wisc.edu>
    Link: http://lkml.kernel.org/r/541AD7E5.8020409@engr.wisc.edu
    Fixes: aee7af356e15 (NFSv4: Fix problems with close in the presence...)
    Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/nfs/nfs4proc.c | 30 +++++++++++++++---------------
    1 file changed, 15 insertions(+), 15 deletions(-)

    --- a/fs/nfs/nfs4proc.c
    +++ b/fs/nfs/nfs4proc.c
    @@ -2599,23 +2599,23 @@ static void nfs4_close_prepare(struct rp
    is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
    is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
    is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
    - /* Calculate the current open share mode */
    - calldata->arg.fmode = 0;
    - if (is_rdonly || is_rdwr)
    - calldata->arg.fmode |= FMODE_READ;
    - if (is_wronly || is_rdwr)
    - calldata->arg.fmode |= FMODE_WRITE;
    /* Calculate the change in open mode */
    + calldata->arg.fmode = 0;
    if (state->n_rdwr == 0) {
    - if (state->n_rdonly == 0) {
    - call_close |= is_rdonly || is_rdwr;
    - calldata->arg.fmode &= ~FMODE_READ;
    - }
    - if (state->n_wronly == 0) {
    - call_close |= is_wronly || is_rdwr;
    - calldata->arg.fmode &= ~FMODE_WRITE;
    - }
    - }
    + if (state->n_rdonly == 0)
    + call_close |= is_rdonly;
    + else if (is_rdonly)
    + calldata->arg.fmode |= FMODE_READ;
    + if (state->n_wronly == 0)
    + call_close |= is_wronly;
    + else if (is_wronly)
    + calldata->arg.fmode |= FMODE_WRITE;
    + } else if (is_rdwr)
    + calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
    +
    + if (calldata->arg.fmode == 0)
    + call_close |= is_rdwr;
    +
    if (!nfs4_valid_open_stateid(state))
    call_close = 0;
    spin_unlock(&state->owner->so_lock);



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